Jens dedichen



, UNITED STATES PATENT OFFICE.

J'EI G'S DEDICHEN, OF BEBLIN-HALENSEE. GERMANY, ASSIGNOR, BY MESNE ASSIGN- MEETS, TO THE CHEMICAL FOUNDATION. INC., A CORPORATION OF DELAWARE.

BLUE TETRAKISAZO DY Es.

1,319,852. In Drawing.

To all whomit may concern:

Be it known that I, Jess DEDICIIEN, a citizen'of Norway, iesiding at Berlin-Halal see, Germany, my l. O. addrcssbeing Scesencrstrasse 25, Berlin-Halensee, Germany, have invented certain new and useful Im provcments in Blue Tetrakisazo Dyes, of.

which the following is a specification.

combining a. diazoarylsulfonic acid '(withthe exception of'Q-diazo-ria hthalene-4-.8-disulfonic acid) with'a midd e component capable, when combined, of being further diazotized, rediazotizing the product thus obtained, combining it with a molecular proportion of a second middle com onent, rediazotizin; again, combining in t 1e presence of an alkali with a molecular vproportion of 2 amino 5 naphthcl-7-sulfonic acid, rediazotizing once again and combining finally with resorcinol.

As middle components 3-toluidin. paraxylidin, 3-amino-4-methoxy 1 methylbenzone, l-naphthylamin or its 6- or 7-sulfon'ic acid, l-amino-2-naphtholether or its 6- m- T- sulfonlo acid, 2-amino-fi-riaphthol-T-sulfonie acid are specially suitable,

Specification of Iettcis Patent.

PatentedOct. 28, 1919.

Application filed November 6, 1910. Serial No. 129,828.

The objects of my invention are new tetrakis-azo-dycs, which dye cotton. blue and may he treated outhe fiber with formaldehyde, thus giving hlue dycings of a good fastness to light and Washing.

The dyes correspond to the general formula:

N =NQOH To illustrate how the process may be carried out the followin example is given, the parts being by wei t:

T e diazo-compoun prepared from 17.3 parts of metanilic acid by means of 6.9 parts of sodium nitrite-and 30 parts of hydrochloric acid of 12 Baum is combined with 14.3 parts of I-napthylamin dissolved with 25 parts of h drochloric acid of 12? Baum in water. T e intermediate product is filtered off, dissolved in water by addition of sodium hydroxid, mixedwith 6.9 parts of sodium nitrite and. diazotizcdtiy mixing with an excess of hydrochloric acid. The diazo compound is mixed with a. solution of 25 parts of sodium-,l-naphthylamin-6-sulfoate. Then sodium acetate is added in a quantity suflicient to 'bind the excess of bydrochlor'ic acid. The intermediate product thus formed is rendered alkaline, salted out and filtered ofl'. Subsequently it is mixed with water and diazotiz'ed with the aid of 7 parts of sodium nitrite and hydrochloric acid by stirring for a good space of time. The combination with 23.9 parts of 2-amino- 5-naphthol-7-sulfonic acid uickly occurs in the presence of an excess 0 sodium carbonate. The trisazo-dye may be isolated by salting out; it is then dissolvedi-n hot water and after coolin at 5 C. diazotized in presence of hydrochfo dium nitrite while stirring, during 3 hours. Then the diam-compound is allowed to flow Pic acid with 7 parts of s0- info a cold solution of 11 parts of resorcinol and dried. It corresponds probably to the maintained alkaline with sodium carbonate. formula: 5 The tetrakisezo-dye is salted out, drained It shows the properties mentioned above. stance similar dyes are obtained if-l'netanilie Its reduction products are metanilie acid, 1.4- acid is replaced by the equivalent quantit Y diaminonaphthalehc, 1.4'- diaminonaphthaof 1-naphthylamin-4.7 or 3.6-d1sulfonic ack 15 lene-6-sulfonic acid, 2.6-diamino-5-naphthol* anilin-2.4 or 2.5-disulfonic acid or 4-chl0ro- 10 I -sulfonic acid and aminoresorcinol. 1-amino-benzene-sulfonic acid. The con- It is to be understood that the invention stitution of the dye mentioned at last may is not limited to the above example. For inbe expressed by the formula:

NIO B 20 Having now described my invention and 1. The herein-described tetrakisazo-dyes in what manner it may be'carried out what of the formula:

where R' is the radical of a B-sulfonic acid of from which the dyes are 'recipitated a ain by 26 the anilin series and R" and R' are radicals the edditiontof ice; yie ding uponre notion of the naphthalene series the sum of m, amihoresorcinohanaminoaryl-3 eulfonicacid 86 an a bei ,3; being in the she of alkali of the benzene series, 1.4-diamino compounds metalselhhckiah powders solu. 1e in water of the naphthalene series and 2.6+diamino-5 to blue solutions from which hydrochloric naphthol-I-sulfouic acid. J V

80 and precipltetee violet flocks and from 2. The herein-described tetrakisazo dyeof which oottou'ls dyed blue; soluble incontheformular centreted lulfuric acid to blackish solutions being in the she 91 its sodium salt I blnektotes violet "flocks and fmm which cotton is ieh powder solu lein water to e blue aoludyed blue soluble in'concentrated sulfuric 45 tion from which hydrochloric acid precipi- Bid to a hhwlrieh Solution from which the dye is separated again by addition of ice; In testimony whereof I affix my signature yielding upon IEdHPtiOll 4-chl0r01-amin0- in presence of two WitIlBSSGS. benzene-3-sulf0nic acid. 1.4-dinminonuphtha- J ENS DEDICHEN. lene, 1.4-dianiinonaphthaleneJi-sulfonic acid, Witnesses: 6 2.6-diamino-5-naphthol-7-sulionic acid and HENRY HAsPEn,

aminoresorcinol. ALLEN E. JENNINGS. 

